The reason? Doctorow’s reader says an Amazon rep told him that Disney wanted to yank it back: “Amazon has explained to me that Disney can pull their content at any time and ‘at this time they’ve pulled that show for exclusivity on their own channel.'”

I asked an Amazon PR rep. Turns out that at least part of the story is true: “What you are referring to was a temporary issue with some of our catalog data and it has been fixed. Customers should never lose access to their Amazon Instant Video purchases. If they have any issues accessing purchased videos, they should contact customer service.”

Translation: Yes, we bricked some content we had previously sold. But that was a bug, not a feature: When you buy a video from us, you get to keep it, even if Disney wants to maximize its TV eyeballs.

So if you’re skittish about buying digital stuff from Amazon or other retailers, that might make you feel better: Yes, Amazon has a kill switch for the content it sold you. But at least for videos, it’s not supposed to use it.

Except in some cases. Note that Amazon’s new Kindle Fire HDX installment payment promotion, which we noted yesterday, uses the kill switch as a sort of digital enforcer/collections agent: If you don’t pay up for your new tablet, Amazon reserves the right to “deregister your Kindle Fire HDX device, which will block your ability to access Amazon content from your Kindle Fire HDX device.”

Meantime, here’s some free Prep & Landing. If it goes away, I can offer you a full refund:

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